. >>> former presidents george w. bush and bill clinton will join president obama at a memorial for nelson mandela next week as south africa mourns its former president's death. crowds outside his johannesburg home are singing their tributes. ♪ hundreds of people of all ages and colors are leaving candles, flowers, stuffed animals and balloons at the home of the civil rights icon. nelson mandela died thursday. he was 95 years old. when you talk about civil rights icons, the conversation ultimately turns to dr. martin luther king jr. well, dr. king never met nelson mandela. he did keep close tabs on the fight for equality in south africa. martin luther king iii said his constant fight for equality personified what me and my father often said, "injustice anywhere is a threat to justice everywhere." martin luther king iii joining me now. i'm quoting your dad. this is bringing so many people of all walks to reflect ton a giant man's life and the market that he left. >> yes, it is. he personified more than anything else